You have to be 20 for ordination iirc, but you might end up spending a year or so at the anagaraka/samaneri stages which means you could start at age 19 or perhaps even now. It would really depend on where you wanted to ordain I think.

Thanks for your responses. when im 18 I most likely will go look for a monestary and look into novice ordination. I also know that my parents would give me their blessings because they know how much spirituality means to me. I think they might think its a good thing!

the Buddha said :

"Intention, monks, is karma, I say. Having willed, one acts through body, speech and mind."